Definition
False weights are weights and measures used in commercial transactions that do not conform to the standard established by law or government authority, or that deviate from the customary standard prevailing in the relevant trade and locality. The use of false weights is a form of commercial fraud — the seller represents a quantity that the instrument of measurement does not accurately reflect, thereby deceiving the buyer as to the amount of goods received.
The offense is both a common law wrong and, historically, a statutory crime in most jurisdictions. At its core, it involves an instrument of measurement — a scale, a bushel, a yard — that has been altered, miscalibrated, or deliberately misrepresented to understate quantity delivered or overstate quantity charged.
Common Language
Modern common usage (Wiktionary): "False weights" is not a standard entry in modern general dictionaries. The component words carry their ordinary meanings: "false" meaning not genuine or intended to deceive, and "weights" meaning objects or instruments used to measure mass.
Historical common usage (Webster's 1913): Webster's 1913 defines "false" as "not according to the truth; not true; erroneous" and "weight" as "the quantity of heaviness; the amount which a thing weighs." The compound phrase does not appear as a standalone entry.
The gap between ordinary and legal meaning is modest but worth noting. In common usage, "false weights" suggests a merely inaccurate instrument. In law, the term carries the additional element of commercial context and, typically, fraudulent intent or at minimum willful noncompliance with a legally prescribed standard. Innocent miscalibration is not the same offense as deliberate use of a nonconforming measure.
Common Confusion
FALSE WEIGHTS vs. FRAUD BY MISREPRESENTATION: False weights is a specific, instrumentality-based offense. General fraud by misrepresentation requires proof of a false statement of fact and reliance. The false weights offense historically required no proof of a specific misrepresentation — the act of using a noncompliant measure was itself the wrong. Researchers should not assume that false weights cases will appear under fraud headings in historical digests.
FALSE WEIGHTS vs. SHORT WEIGHT: "Short weight" is the practical result — delivery of less than the stated quantity. "False weights" refers to the instrument causing that result. Statutes may punish either the instrument (possession or use of false weights) or the outcome (delivering short weight), and historical sources treat these as related but distinct wrongs.
Why It Matters in Research
This term is primarily encountered in three research contexts: criminal law history, commercial regulation, and administrative law governing weights and measures bureaus.
Historical sources will index false weights cases under criminal law (as a misdemeanor or regulatory offense), market regulation, and occasionally under the heading "assize" — the medieval and early modern system by which governments regulated the standard measures of bread, ale, coal, and other staple commodities. Researchers working in pre-twentieth-century sources should check assize headings and market regulation materials alongside any modern regulatory entry.
The standard against which a weight is measured matters. Black's Law Dictionary notes two possible standards: the government-prescribed standard, and the "custom prevailing in the place and business." This dual-standard structure is significant for historical research — in periods or localities where no statutory standard existed, courts looked to trade custom. A weight lawful by one custom might be actionable under another. Do not assume a single universal standard applies across time or jurisdiction.
Twentieth-century sources will connect false weights to the regulatory apparatus of state weights and measures bureaus and, federally, to the National Bureau of Standards (now NIST). The offense migrates from criminal law digests into administrative and regulatory law headings in this period. Researchers tracing the law across the nineteenth-to-twentieth-century transition should look in both places.
The false weights offense has no meaningful presence in modern federal criminal law as a standalone charge. Contemporary commercial fraud involving measurement is more likely prosecuted under wire fraud, mail fraud, or consumer protection statutes. Do not expect continuity of the specific "false weights" label in post-1950 sources.
Historical Dictionary Support
Black's Law Dictionary defines false weights and measures as "such as do not comply with the standard prescribed by the state or government, or with the custom prevailing in the place and business in which they are used," citing 7 American and English Encyclopedia of Law 796 and Las Partidas. The reference to Las Partidas — the thirteenth-century Castilian legal code — signals the antiquity of the offense and its presence across European legal traditions. Black's entry is spare, functioning more as a cross-reference than a full treatment.
The historical sources are thin on this term as a standalone entry. Most detailed treatment in historical legal encyclopedias appears under "weights and measures" as a subject heading rather than under "false weights" as a discrete term. Researchers relying solely on Black's definition will have the core concept but will miss the procedural and evidentiary dimensions developed in the encyclopedia literature. The American and English Encyclopedia of Law entry cited by Black's is the more substantive source for nineteenth-century treatment.
No major historical legal dictionary offers a meaningfully different definition. There is agreement across sources that noncompliance with the prescribed standard — statutory or customary — is the operative test.
Jurisdictional Note
Weights and measures law is historically state law in the United States. Standards are set by state statute, and enforcement has been a state and local function. Federal involvement grew significantly in the twentieth century through the National Bureau of Standards and uniform model laws, but the underlying offense remains primarily a creature of state regulatory and criminal codes. Researchers should identify the controlling state statute for any given period and jurisdiction rather than assuming a uniform national standard.
Encyclopedia Cross-Reference
The Law Mind Criminal Law Encyclopedia: Government Contract Fraud (False Claims Act) (criminal_98) — relevant for researchers examining the broader category of fraud offenses involving false representations to obtain payment, of which false weights is a historical precursor form.